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DIGITAL PHASE-LOCKED LOOP WITH GATED TIME-TO-DIGITAL CONVERTER

  • US 20090175399A1
  • Filed: 01/04/2008
  • Published: 07/09/2009
  • Est. Priority Date: 01/04/2008
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a time-to-digital converter (TDC) configured to receive a first clock signal and a first reference signal and to provide a TDC output indicative of a phase difference between the first clock signal and the first reference signal; and

    a control unit configured to generate an enable signal based on a main reference signal and to enable and disable the TDC based on the enable signal.

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